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H. E. WAITE.

RECEIVER FOR TELEPHONES. No. 250,305. Patented Nbv. 29,1881.

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UNITED STATES PATENT OFFICE.

HENRY E. \VAITE, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO CHARLES F. LIVERMORE, OF NEW YORK, N. Y.

RECEIVER FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 250,805, dated November 29, 1881. Application filed May 93, 1881. (No model.)

To all whom it may concern:

Be it known that I, HENRY E. WVAITE, of Bridgeport, county of Fairfield, State of Connecticut, have invented new and useful Improvements in Receivers for Telephones, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- Figure 1 represents a section through my improved receiver complete. Fig. 2 represents the bar-magnet with its spool or coil, and Fig. 3 represents a sleeve or cylinder surrounding the magnet provided with the diaphragm-extensions and a coil or helix.

The invention relates to a novel construction of the magnet and to the arrangement of the coil relatively thereto and to the sounding board or diaphragms, whereby I am enabled to give increased efficiency to the variations in degree of polarity caused by disturbances in the current, as hereinafter explained.

In the accompanying drawings, Arepresents the body or handle of the receiver, expanded at one end into cylindrical form and cored out from one side, forming a hollow chamber, or

provided with a cylindrical cup, B, attached by its side to the end of the handle and open at one side for the reception of a diaphragm 0 and the ear-piece. The handle has alongitudinal bore or perforation, in which is placed a bar-magnet, C, and a sleeve, D, surrounding the same, the ends of which project within the cup or chamber B, as will be explained, and

5 adjacent to said cup or chamber the end of the handle is cored out or chambered to receive a coil or helix, E, surrounding the magnet and its sleeve D, which forms a part of the magnet. The end 0 of the bar-magnet C, project- 0 ing within the cup or chamber B, is turned do wn ,except atthe extreme end, where a flange or button, 0 is left upon it, giving said end a spool form, adapting it to receive the coil E,

wound thereon, making said portion with the 5 coil of about the same diameter as the body of the magnet, the sleeve D, which may be made of sheet metal bent into cylindrical form,

snugly surrounding the body of the magnet C, except at the end projecting within the cup or chamber B, where the sheet is cut away,

leaving two arms, d d, diverging fro m the plane of the magnet on opposite sides, and terminating in flat parallel disks D D the former of which, I), is shown secured to the open end of the cup B by the ear-piece F and forms the sounding board or diaphragm of the receiver, while the disk D is made of smaller diameter, and, lying upon the opposite side of the spool or helix E and near the bottom or inner wall of the cup, is allowed to vibrate freely under the disturbances in the current. Upon the sleeve thusformed, in close proximity with the arms 01 d, is placed the coil E within the socket in the handle A, and the wires of coil E are connected with coil E, as show-n, or in any usual way. By this arrangement the sleeve D, with its arms and disks D D is made to form a part of the magnet, the disks D D extending in planes parallel with and upon opposite sides of the extension or spool c of the bar-magnet C, on which the coil E is wound, and the receiver is provided with two coils, one within the chamber, between and with its axis parallel with the diaphragm, forming extensions of the magnet, and the other outside of the cup or chamber, and surrounding the sleeve which incloses the bar-magnet, and the variations or disturbanees in degree of polarity in the different parts of the same pole are thus greatly intensified.

The disk D instead of being left free to so vibrate, as described, may be secured at its edges, like disk D, by any suitable appliances for that purpose, and the disk D, instead of being fastened as described, may be upheld against the flange or rim on the ear-piece by the tension of the spring-arm only, if desired; but the construction and arrangement described is preferred, as producing the most satisfactory results.

The sleeve with its disk-extensions is made 0 of magnetic material, and closely wraps the bar-magnet, the disks being thus made 'to form flattened extensions of the adjacent pole of said magnet. The disturbances in the latter caused by those in the current passing through 5 the coils are communicated thereto, the ar rangement being such as to increase the variations in degree of disturbance in the differ= ent parts of the same pole. The arrangement of the two disks upon opposite sides of the mo inclosed coil causes them to be disturbed, or to vibrate, so to speak, in opposite directions, and so to intensify the disturbance in the soundchamber.

Ordinarily the two coils will be wound in the same direction as the power of the magnet, as such is thereby increased.

Having now described my invention, I claim 1. The magnet having the spool formed upon it, in combination with the sleeve of magnetic material surrounding the same, and provided with the flattened disks or sounding-boards, substantially as described.

2. The combination, in a telephone-receiver, of a magnet provided with a coil or helix arranged within the sound-chamber, a sleeve of magnetic metal surrounding said magnet, and disk-extensions of said sleeve arranged on opposite sides of the coil and magnet.

3. The magnet having the coil or helix upon it arranged within the sound-chamber of the receiver, in combination with the sleeve of magnetic metal having disk or diaphragm extensions on opposite sides of said coil, and with the coil or helix applied thereto outside of said sound-chamber, and connected with the inner coil, substantially as described.

4. The combination, in a telephone-receiver, of the magnet with its coil or helix, the sleeve surrounding said magnet and provided with disks of magnetic metal, and a second coil or helix in circuit with the inner coil, all arranged and operating substantially as described.

In testimony whereof I have hereunto set my hand this 19th day of May, A. D. 1881.

HENRY E. WAITE.

Witnesses ALEX. MAI-ION, J. M. YZNAGA. 

